Pipeline Task Report Generator fails - gradle

Question

I'm trying to create a test coverage report in Azure DevOps pipelines but I get The report file "path" is invalid. File does not exist.
Before I run this failing task, I run a task to execute the tests, and I see that task runTestsWithJacoco, defined in the build.gradle to create a Jacoco report is SKIPPED.
I'm using gradle 7.0.1 and jacoco version 0.8.7.
The gradle buil for project:
buildscript {
ext.jacoco_version = "0.8.7"
repositories {
google()
mavenCentral()
}
dependencies {
classpath "com.android.tools.build:gradle:7.0.1"
classpath "org.jacoco:org.jacoco.core:$jacoco_version"
}
}
apply plugin: PropertiesPlugin
allprojects {
repositories {
google()
mavenCentral()
}
}
The gradle.build for app
plugins {
id 'jacoco'
}
jacoco {
toolVersion = jacoco_version
}
tasks.withType(Test) {
jacoco.includeNoLocationClasses = true
jacoco.excludes = ['jdk.internal.*']
}
android {
testOptions {
unitTests.all {
useJUnitPlatform()
}
unitTests {
includeAndroidResources = true
}
}
}
task runTestsWithJacoco(
type: JacocoReport,
dependsOn: ['testDebugUnitTest'],
group: 'Reporting',
description: 'Running my tests with jacoco'
) {
def coverageSourceDirs = [
"src/main/java"
]
def fileFilter = [
'**/R.class',
'**/R$*.class',
'**/*$ViewInjector*.*',
'**/*$ViewBinder*.*',
'**/BuildConfig.*',
'**/Manifest*.*'
]
def javaClasses = fileTree(
dir: buildDir,
includes: ['intermediates/javac/debug/classes/**'],
excludes: fileFilter
)
classDirectories.from(files([ javaClasses ]))
additionalSourceDirs.from(files(coverageSourceDirs))
sourceDirectories.from(files(coverageSourceDirs))
executionData.from(fileTree(dir: buildDir, includes: [
"jacoco/testDebugUnitTest.exec"
]))
reports {
xml.enabled = true
html.enabled = true
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
}
The pipeline:
trigger:
- master
pool:
vmImage: 'ubuntu-latest'
steps:
- task: Gradle#2
name: run_unit_tests
inputs:
workingDirectory: ''
gradleWrapperFile: 'gradlew'
gradleOptions: '-Xmx3072m'
publishJUnitResults: true
testResultsFiles: 'app/build/test-results/testDebugUnitTest/TEST-*.xml'
tasks: ':app:runTestsWithJacoco'
- task: reportgenerator#4
name: generate_report
inputs:
reports: 'app/build/reports/jacoco/runTestsWithJacoco/runUnitTestsWithCoverage.xml'
targetdir: 'coverage'
sourcedirs: 'service/src/main/java'
reporttypes: 'Badges;HtmlInline_AzurePipelines;Cobertura'
Why does reportgenerator#4 fail?
I appreciate any help.

Answer 1

I can reproduce the same issue in reportgenerator#4 task.
The root cause of this issue can be that the publishing path you set is invalid.
You can check the build log in Gradle task and check if you can see the following log record:
To solve this issue, you can try the following sample:
- task: Gradle#2
name: run_unit_tests
inputs:
workingDirectory: ''
gradleWrapperFile: 'gradlew'
gradleOptions: '-Xmx3072m'
publishJUnitResults: true
testResultsFiles: '**/TEST-*.xml'
tasks: ':app:runTestsWithJacoco'
- task: reportgenerator#4
name: generate_report
inputs:
reports: '$(build.sourcesdirectory)/build/test-results/TEST-*.xml'
targetdir: 'coverage'
sourcedirs: 'service/src/main/java'
reporttypes: 'Badges;HtmlInline_AzurePipelines;Cobertura'
Result:

Answer 2

I ended up changing the build agent from Ubuntu to MacOS and that stopped the build from falling. I don't know the reason why it was failing with Ubuntu.